CN207180902U - A kind of high precision temperature acquisition circuit - Google Patents
A kind of high precision temperature acquisition circuit Download PDFInfo
- Publication number
- CN207180902U CN207180902U CN201721119755.9U CN201721119755U CN207180902U CN 207180902 U CN207180902 U CN 207180902U CN 201721119755 U CN201721119755 U CN 201721119755U CN 207180902 U CN207180902 U CN 207180902U
- Authority
- CN
- China
- Prior art keywords
- circuit
- output
- resistance
- bridge
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Amplifiers (AREA)
Abstract
The utility model belongs to technical field of analytical instruments, propose a kind of high precision temperature acquisition circuit, including the high-frequency filter circuit being sequentially connected, bridge circuit, difference puts input circuit, differential voltage amplifying circuit and difference put output circuit, the input of high-frequency filter circuit is connected by the first terminal and thermistor output, the output that difference puts output circuit is connected with main control chip, bridge circuit includes thermistor, first resistor, second resistance and the 4th resistance, thermistor is composed in series half-bridge one with first resistor, second resistance and the 4th resistant series composition half-bridge two, half-bridge one and half-bridge two are in parallel.Pass through above-mentioned technical proposal, solve the problems, such as that temperature collection circuit precision is low in the prior art, anti-interference is poor.
Description
Technical field
The utility model belongs to technical field of analytical instruments, is related to a kind of high precision temperature acquisition circuit.
Background technology
With industrialized development, environmental pollution aggravates, and especially various harmful substances are more and more present in us
Around life, so the analysis to harmful substance in laboratory operation is more and more.Most of analyze harmful substance needs
Carried out in the environment of heating, so to temperature controlled required precision more and more higher.
Traditional temperature collection circuit precision is low, anti-interference is poor, so a kind of high-precision temperature collection circuit of design,
The precision of analysis for improving laboratory harmful substance is significant.
Utility model content
The utility model proposes a kind of high precision temperature acquisition circuit, solves temperature collection circuit precision in the prior art
Low, the problem of anti-interference is poor.
What the technical solution of the utility model was realized in：
A kind of high precision temperature acquisition circuit, including：
High-frequency filter circuit, bridge circuit, difference including being sequentially connected put input circuit, differential voltage amplifying circuit and difference
Output circuit is put, the input of the high-frequency filter circuit is connected by the first terminal and thermistor output, and the difference puts output
The output of circuit is connected with main control chip,
The bridge circuit includes thermistor, first resistor, second resistance and the 4th resistance, the thermistor and institute
State first resistor and be composed in series half-bridge one, the second resistance and the 4th resistant series composition half-bridge two, the half-bridge one
It is in parallel with the half-bridge two,
The differential voltage amplifying circuit includes the first chip and the 6th resistance, and the 6th resistor coupled in parallel is described first
Between the pin of chip first and the 8th pin, the second pin of first chip and the 3rd pin put input electricity with the difference
Road connects, and the 6th pin of first chip is put output circuit with the difference and is connected, and the first chip concrete model is
AD623。
Further, the differential voltage input amplifier is also connected with protection circuit against input over-voltage, the differential electrical
Pressure amplification circuit output end is also connected with output overvoltage protection circuit.
Further, the high-frequency filter circuit includes the first EI wave filters, the 2nd EI wave filters and the 3rd EI wave filters, institute
The input for stating the first EI wave filters is connected with the pin of the first terminal first, the output end of the first EI wave filters and institute
Bridge circuit connection is stated, the input of the 2nd EI wave filters is connected with the first terminal second pin, the 2nd EI
The output end of wave filter is connected with the bridge circuit, and input and the first terminal the 3rd of the 3rd EI wave filters draw
Pin is connected, and the output end and common port of the first EI wave filters are grounded.
Further, the difference, which puts input circuit, includes 3rd resistor, the 5th resistance, the first electric capacity, the second electric capacity and the 3rd
Electric capacity, described 3rd resistor one end are connected with the output end of the half-bridge one, the 3rd resistor other end and the differential electrical
The in-phase input end connection of amplifying circuit is pressed, described 5th resistance one end is connected with the output end of the half-bridge two, and the described 5th
The resistance other end is connected with the inverting input of the differential voltage amplifying circuit, and first electric capacity is connected in parallel on the differential electrical
Between the in-phase input end and ground of pressing amplifying circuit, second electric capacity is connected in parallel on the same mutually defeated of the differential voltage amplifying circuit
Enter between end and inverting input, the 3rd electric capacity is connected in parallel on the inverting input and ground of the differential voltage amplifying circuit
Between.
Further, the difference, which puts output circuit, includes the 7th resistance, the 8th resistance, the 4th electric capacity, the 5th electric capacity and the 6th
Electric capacity, described 7th resistance one end are connected with the output of the differential voltage amplifying circuit, and the other end passes through the 8th resistance and master
Control chip connection, the 6th electric capacity in parallel between the 7th resistance and the tie point and ground of the 8th resistance, the 4th electricity
Hold the electric capacity of box the 5th to be connected in parallel between power supply and ground.
Further, the protection circuit against input over-voltage includes diode one and diode two, the diode one and described
Diode two is bilateral diode, and includes three terminals, and the anode of diode one is connected to ground, and negative electrode connects with power supply
Connect, common port is connected with the inverting input of the differential voltage amplifying circuit, and the anode of diode two is connected to ground, negative electrode
It is connected with power supply, common port is connected with the in-phase input end of the differential voltage amplifying circuit.
Further, the output overvoltage protection circuit includes diode three, and the diode three is bilateral diode, and wraps
Three terminals are included, the anode of diode three is connected to ground, and negative electrode is connected with power supply, common port and differential voltage amplification electricity
Road output connection.
The beneficial effects of the utility model are：
1st, by the output access bridge circuit of thermistor, two output ends of bridge circuit connect the utility model respectively
Enter the in-phase input end and inverting input of differential voltage amplifying circuit, after carrying out differential voltage amplification, be sent into main control chip
AD samplings are carried out, obtain the exact numerical of bridge circuit output voltage, the change of bridge circuit output voltage and thermistor
Change corresponds, so as to realize the precise acquisition of temperature data.Bridge circuit has high sensitivity when carrying out resistance measurement
And the degree of accuracy, differential voltage amplifying circuit use high-accuracy operational amplifier A D623, such design, improve temperature acquisition
The precision of circuit.
High-frequency filter circuit is set before bridge circuit, external circuit is reduced and is done to caused by temperature collection circuit
Disturb, improve anti-interference of the present utility model；Difference puts input circuit and difference puts the work that output circuit not only acts as impedance matching
With, signal reflex is eliminated, and the input/output signal of differential voltage amplifying circuit can be filtered, it is further ensured that
The precision of temperature collection circuit.
2nd, protection circuit against input over-voltage by the applied signal voltage clamper of differential voltage amplifying circuit in supply voltage and ground
Between, output overvoltage protection circuit by the output signal voltage clamper of differential voltage amplifying circuit between the supply voltage and ground,
Avoid the overvoltage in circuit running from causing to damage to differential voltage amplifying circuit and main control chip, it is new to improve this practicality
The reliability of type.
3rd, 3rd resistor and the 5th resistance are connected on the in-phase input end and inverting input of differential voltage amplifying circuit respectively
Front end, play a part of impedance matching, for eliminating signal reflex；Meanwhile 3rd resistor and the first electric capacity, the 5th resistance and
3rd electric capacity respectively constitutes RC filter circuits, carries out High frequency filter to the voltage signal for entering differential voltage amplifying circuit, eliminates
High-frequency Interference；Second electric capacity is connected in parallel between the in-phase input end and inverting input of differential voltage amplifying circuit, plays phase
The effect of position compensation.
4th, the 7th resistance is connected on the output end of differential voltage amplifying circuit, plays a part of impedance matching, believes for eliminating
Number reflection；Meanwhile the 7th resistance and the 6th electric capacity form RC filter circuits, the output signal of differential voltage amplifying circuit is carried out
High frequency filter；4th electric capacity and the 5th electric capacity are connected in parallel between power supply and ground, ensure the stabilization of supply voltage.
Brief description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the utility model circuit block diagram；
Fig. 2 is the utility model circuit theory diagrams；
In figure：1- the first terminals, 2- high-frequency filter circuits, 3- bridge circuits, 31- half-bridges one, 32- half-bridges two, 4- differences are put
Input circuit, 5- differential voltage amplifying circuits, 6- differences put output circuit, 7- protection circuit against input over-voltage, 8- output over-voltage protections
Circuit.
Embodiment
Below in conjunction with the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole embodiments.
Based on the embodiment in the utility model, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belong to the scope of the utility model protection.
As Figure 1-Figure 2, the utility model proposes a kind of high precision temperature acquisition circuit, including：
A kind of high precision temperature acquisition circuit, including：
High-frequency filter circuit 2, bridge circuit 3, difference including being sequentially connected put input circuit 4, differential voltage amplifying circuit 5
Output circuit 6 is put with difference, the input of high-frequency filter circuit 2 is connected by the first terminal 1 and thermistor output, and difference puts output electricity
The output on road 6 is connected with main control chip,
Bridge circuit 3 includes thermistor, first resistor, second resistance and the 4th resistance, thermistor and first resistor
Half-bridge 1, second resistance and the 4th resistant series composition half-bridge 2 32 are composed in series, half-bridge 1 and half-bridge 2 32 are in parallel,
Differential voltage amplifying circuit 5 includes the first chip and the 6th resistance, and the 6th resistor coupled in parallel draws in the first chip first
Between pin and the 8th pin, the second pin of the first chip and the 3rd pin are put input circuit 4 with difference and are connected, the first chip
6th pin is put output circuit 6 with difference and is connected, and the first chip concrete model is AD623.
By in the output access bridge circuit 3 of thermistor, two output ends of bridge circuit 3 connect the utility model respectively
Enter the in-phase input end and inverting input of differential voltage amplifying circuit 5, after carrying out differential voltage amplification, be sent into main control chip
AD samplings are carried out, obtain the exact numerical of the output voltage of bridge circuit 3, the change of the output voltage of bridge circuit 3 and thermistor
Change correspond, so as to realize the precise acquisition of temperature data.Bridge circuit 3 has highly sensitive when carrying out resistance measurement
Degree and the degree of accuracy, differential voltage amplifying circuit 5 use high-accuracy operational amplifier A D623, such design, improve temperature and adopt
The precision of collector.
High-frequency filter circuit 2 is set before bridge circuit 3, external circuit is reduced and is done to caused by temperature collection circuit
Disturb, improve anti-interference of the present utility model；Difference puts input circuit 4 and difference puts output circuit 6 and not only acts as impedance matching
Effect, eliminates signal reflex, and the input/output signal of differential voltage amplifying circuit 5 can be filtered, further
It ensure that the precision of temperature collection circuit.
Further, the input of differential voltage amplifying circuit 5 is also connected with protection circuit against input over-voltage 7, differential voltage amplification
The output end of circuit 5 is also connected with output overvoltage protection circuit 8.
Protection circuit against input over-voltage 7 is by the applied signal voltage clamper of differential voltage amplifying circuit 5 in supply voltage and ground
Between, output overvoltage protection circuit 8 is by the output signal voltage clamper of differential voltage amplifying circuit 5 in supply voltage and ground
Between, avoid the overvoltage in circuit running from causing to damage to differential voltage amplifying circuit 5 and main control chip, improve this reality
With new reliability.
Further, high-frequency filter circuit 2 includes the first EI wave filters, the 2nd EI wave filters and the 3rd EI wave filters, and first
The input of EI wave filters is connected with the pin of the first terminal 1 first, and the output end of the first EI wave filters is connected with bridge circuit 3,
The input of 2nd EI wave filters is connected with the second pin of the first terminal 1, and output end and the bridge circuit 3 of the 2nd EI wave filters connect
Connect, the input of the 3rd EI wave filters is connected with the pin of the first terminal 1 the 3rd, and the output end and common port of the first EI wave filters are equal
Ground connection.
Further, difference, which puts input circuit 4, includes 3rd resistor, the 5th resistance, the first electric capacity, the second electric capacity and the 3rd electricity
Hold, 3rd resistor one end is connected with the output end of half-bridge 1, the same phase of the 3rd resistor other end and differential voltage amplifying circuit 5
Input is connected, and the 5th resistance one end is connected with the output end of half-bridge 2 32, the 5th resistance other end and differential voltage amplification electricity
The inverting input connection on road 5, the first electric capacity are connected in parallel between the in-phase input end and ground of differential voltage amplifying circuit 5, and second
Electric capacity is connected in parallel between the in-phase input end and inverting input of differential voltage amplifying circuit 5, and the 3rd electric capacity is connected in parallel on differential electrical
Between the inverting input and ground of pressing amplifying circuit 5.
3rd resistor and the 5th resistance are connected on the in-phase input end and inverting input of differential voltage amplifying circuit 5 respectively
Front end, play a part of impedance matching, for eliminating signal reflex；Meanwhile 3rd resistor and the first electric capacity, the 5th resistance and
Three electric capacity respectively constitute RC filter circuits, carry out High frequency filter to the voltage signal for entering differential voltage amplifying circuit 5, eliminate
High-frequency Interference；Second electric capacity is connected in parallel between the in-phase input end and inverting input of differential voltage amplifying circuit 5, plays phase
The effect of compensation.
Further, difference, which puts output circuit 6, includes the 7th resistance, the 8th resistance, the 4th electric capacity, the 5th electric capacity and the 6th electricity
Hold, the 7th resistance one end is connected with the output of differential voltage amplifying circuit 5, and the other end is connected by the 8th resistance and main control chip
Connect, the 6th electric capacity in parallel between the 7th resistance and the tie point and ground of the 8th resistance, the electric capacity of the 4th capacitor box the 5th is connected in parallel on
Between power supply and ground.
7th resistance is connected on the output end of differential voltage amplifying circuit 5, plays a part of impedance matching, for eliminating signal
Reflection；Meanwhile the 7th resistance and the 6th electric capacity form RC filter circuits, the output signal of differential voltage amplifying circuit 5 is carried out
High frequency filter；4th electric capacity and the 5th electric capacity are connected in parallel between power supply and ground, ensure the stabilization of supply voltage.
Further, protection circuit against input over-voltage 7 includes diode one and diode two, and diode one and diode two are
Bilateral diode, and include three terminals, the anode of diode one is connected to ground, and negative electrode is connected with power supply, common port and difference
The inverting input connection of voltage amplifier circuit 5, the anode of diode two is connected to ground, and negative electrode is connected with power supply, common port and poor
The in-phase input end connection of component voltage amplifying circuit 5.
Further, output overvoltage protection circuit 8 includes diode three, and diode three is bilateral diode, and including three
Terminal, the anode of diode three are connected to ground, and negative electrode is connected with power supply, and common port connects with the output of differential voltage amplifying circuit 5.
Preferred embodiment of the present utility model is these are only, it is all in this practicality not to limit the utility model
Within new spirit and principle, any modification, equivalent substitution and improvements made etc., guarantor of the present utility model should be included in
Within the scope of shield.
Claims (7)
- A kind of 1. high precision temperature acquisition circuit, it is characterised in that：Including high-frequency filter circuit (2), the electric bridge electricity being sequentially connected Road (3), difference put input circuit (4), differential voltage amplifying circuit (5) and difference and put output circuit (6), the high-frequency filter circuit (2) input is connected by the first terminal (1) and thermistor output, and the difference puts output and the master control core of output circuit (6) Piece connects,The bridge circuit (3) includes thermistor, first resistor, second resistance and the 4th resistance, the thermistor and institute State first resistor and be composed in series half-bridge one (31), the second resistance and the 4th resistant series composition half-bridge two (32), institute State half-bridge one (31) and the half-bridge two (32) be in parallel,The differential voltage amplifying circuit (5) includes the first chip and the 6th resistance, and the 6th resistor coupled in parallel is described first Between the pin of chip first and the 8th pin, the second pin of first chip and the 3rd pin put input electricity with the difference Road (4) connects, and the 6th pin and the difference of first chip are put output circuit (6) and be connected, the first chip particular type Number it is AD623.
- A kind of 2. high precision temperature acquisition circuit according to claim 1, it is characterised in that：The differential voltage amplification electricity Road (5) input is also connected with protection circuit against input over-voltage (7), differential voltage amplifying circuit (5) output end also with output Overvoltage crowbar (8) connects.
- A kind of 3. high precision temperature acquisition circuit according to claim 1, it is characterised in that：The high-frequency filter circuit (2) include the first EI wave filters, the 2nd EI wave filters and the 3rd EI wave filters, the input of the first EI wave filters with it is described The pin of the first terminal (1) first connects, and the output end of the first EI wave filters is connected with the bridge circuit (3), and described the The input of two EI wave filters is connected with the first terminal (1) second pin, the output end of the 2nd EI wave filters and institute Bridge circuit (3) connection is stated, the input of the 3rd EI wave filters is connected with the pin of the first terminal (1) the 3rd, described The output end and common port of first EI wave filters are grounded.
- A kind of 4. high precision temperature acquisition circuit according to claim 1, it is characterised in that：The difference puts input circuit (4) 3rd resistor, the 5th resistance, the first electric capacity, the second electric capacity and the 3rd electric capacity, described 3rd resistor one end and described half are included The output end connection of bridge one (31), the 3rd resistor other end and the in-phase input end of the differential voltage amplifying circuit (5) Connection, described 5th resistance one end are connected with the output end of the half-bridge two (32), the 5th resistance other end and the difference The inverting input connection of component voltage amplifying circuit (5), first electric capacity are connected in parallel on the differential voltage amplifying circuit (5) Between in-phase input end and ground, second electric capacity be connected in parallel on the in-phase input end of the differential voltage amplifying circuit (5) with it is anti- Between phase input, the 3rd electric capacity is connected in parallel between the inverting input and ground of the differential voltage amplifying circuit (5).
- A kind of 5. high precision temperature acquisition circuit according to claim 1, it is characterised in that：The difference puts output circuit (6) the 7th resistance, the 8th resistance, the 4th electric capacity, the 5th electric capacity and the 6th electric capacity, described 7th resistance one end and the difference are included The output connection of component voltage amplifying circuit (5), the other end are connected by the 8th resistance with main control chip, the 7th resistance and institute The 6th electric capacity in parallel between the tie point and ground of the 8th resistance is stated, the electric capacity of the 4th capacitor box the 5th is connected in parallel on power supply and ground Between.
- A kind of 6. high precision temperature acquisition circuit according to claim 2, it is characterised in that：The input overvoltage protection electricity Road (7) includes diode one and diode two, and the diode one and the diode two are bilateral diode, and are included Three terminals, the anode of diode one are connected to ground, and negative electrode is connected with power supply, common port and the differential voltage amplifying circuit (5) inverting input connection, the anode of diode two are connected to ground, and negative electrode is connected with power supply, common port and the difference The in-phase input end connection of voltage amplifier circuit (5).
- A kind of 7. high precision temperature acquisition circuit according to claim 2, it is characterised in that：The output over-voltage protection electricity Road (8) includes diode three, and the diode three is bilateral diode, and including three terminals, the anode of diode three with Ground is connected, and negative electrode is connected with power supply, and common port connects with the differential voltage amplifying circuit (5) output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721119755.9U CN207180902U (en) | 2017-09-01 | 2017-09-01 | A kind of high precision temperature acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721119755.9U CN207180902U (en) | 2017-09-01 | 2017-09-01 | A kind of high precision temperature acquisition circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207180902U true CN207180902U (en) | 2018-04-03 |
Family
ID=61742628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721119755.9U Active CN207180902U (en) | 2017-09-01 | 2017-09-01 | A kind of high precision temperature acquisition circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207180902U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357781A (en) * | 2018-12-10 | 2019-02-19 | 中国航发南方工业有限公司 | Resistance and temperature signal conditioning circuit and electronic controller |
| CN109412542A (en) * | 2018-12-10 | 2019-03-01 | 中国航发南方工业有限公司 | Pressure signal conditioning circuit and electronic controller |
| CN112113624A (en) * | 2020-09-24 | 2020-12-22 | 河北紫旭节能环保技术咨询有限公司 | Water flow monitoring equipment |
| CN116170019A (en) * | 2023-01-06 | 2023-05-26 | 深圳市西京电力科技有限公司 | High-power electronic device based on semiconductor thermistor |
-
2017
- 2017-09-01 CN CN201721119755.9U patent/CN207180902U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357781A (en) * | 2018-12-10 | 2019-02-19 | 中国航发南方工业有限公司 | Resistance and temperature signal conditioning circuit and electronic controller |
| CN109412542A (en) * | 2018-12-10 | 2019-03-01 | 中国航发南方工业有限公司 | Pressure signal conditioning circuit and electronic controller |
| CN109412542B (en) * | 2018-12-10 | 2022-11-04 | 中国航发南方工业有限公司 | Pressure signal conditioning circuit and electronic controller |
| CN112113624A (en) * | 2020-09-24 | 2020-12-22 | 河北紫旭节能环保技术咨询有限公司 | Water flow monitoring equipment |
| CN112113624B (en) * | 2020-09-24 | 2023-12-05 | 河北紫旭节能环保技术咨询有限公司 | Water flow monitoring device |
| CN116170019A (en) * | 2023-01-06 | 2023-05-26 | 深圳市西京电力科技有限公司 | High-power electronic device based on semiconductor thermistor |
| CN116170019B (en) * | 2023-01-06 | 2024-05-24 | 深圳市首创达电子科技有限公司 | High-power electronic device based on semiconductor thermistor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207180902U (en) | A kind of high precision temperature acquisition circuit | |
| CN204613137U (en) | Air-anion concentration detector | |
| CN103529268B (en) | A kind of alternating current bridge and impedance measurement method with auxiliary equilibrium function automatically | |
| CN107219402A (en) | A kind of circuit for quick measurement of DC resistance for power module port | |
| CN102680768B (en) | Mono-polar type voltage measurement sensor with self-correction and self-construct electric filed and measurement method | |
| CN103995024A (en) | Measure method applied to circuit of resistor-type moisture measure sensor | |
| CN203660994U (en) | Micro-current amplifier | |
| CN205037982U (en) | Utilize constant current source temperature detection circuit of operational amplifier characteristic | |
| CN204008832U (en) | A kind of sampling A/D chip and the sample circuit of built-in AD to same passage of measuring | |
| CN203069764U (en) | Electric parameter measurement circuit of battery pack | |
| CN206300734U (en) | A kind of temperature survey change-over circuit | |
| CN204389668U (en) | A kind of ground voltage influence amount simulator | |
| CN209043964U (en) | Current sensor | |
| CN103487626A (en) | Measuring circuit | |
| CN103063925B (en) | A kind of lithium battery protection board internal resistance measurement method and device | |
| CN206378535U (en) | A kind of detection platform of small resistor resistance | |
| CN206848359U (en) | A kind of high precision electro flow measurement circuitry | |
| CN202918246U (en) | Preposed charge amplifier with low noise | |
| CN106932816A (en) | The voltage follower of Geological data collecting device | |
| CN203595742U (en) | Broadband low current measuring device based on Isolated PCB type Rogowski coil | |
| CN206876753U (en) | A kind of automobile charging box | |
| CN110098590A (en) | It is a kind of to be spaced apart circuit with metering and the integrated intelligent of defencive function | |
| CN206193115U (en) | Multi -functional three -phase electricity parameter acquisition device | |
| CN205643470U (en) | Voltage acquisition electronic sensor device | |
| CN202956434U (en) | Internal resistance measuring device of lithium battery protection plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 050000 Fourth Floor, Building No. 3, 46 Youyinan Street, Qiaoxi District, Shijiazhuang City, Hebei Province Patentee after: Hebei Huaqing Environmental Science and Technology Group Co.,Ltd. Address before: 050000 Fourth Floor, Building No. 3, 46 Youyinan Street, Qiaoxi District, Shijiazhuang City, Hebei Province Patentee before: HEBEI HUAQING ENVIRONMENT TECHNOLOGY Co.,Ltd. |